IP Library › Patent Application 14405573
Patent Application
App. No. 14/405,573

METHOD FOR STABILIZING POLYMERS CONTAINING ESTER GROUPS

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Quick Facts
Patent No.
US None
App. No.
14/405,573
Abstract

The invention relates to methods for stabilizing polymers containing ester groups, in which specific monomeric aromatic carbodiimides are added in liquid-dosed form in the course of preparation thereof and/or processing thereof.

Claims (8)

1 . A method for stabilizing polymers containing ester groups, characterized in that carbodiimides of the formula (I)

where R 1 , R 2 , R 4 and R 6 is each independently C 3 -C 6 -alkyl

and R 3 and R 5 is each independently C 1 -C 3 alkyl,

are added in liquid form (liquid-dosed) in continuous or batch wise processes for preparation and/or processing thereof.

2 . The method as claimed in claim 1 , characterized in that the R 1 to R 6 radicals are the same within the molecule.

3 . The method as claimed in claim 1 or 2 , characterized in that the R 1 to R 6 radicals are isopropyl.

4 . The method as claimed in claim 1 , characterized in that the liquid carbodiimide is added at temperatures of 10-35° C.

5 . The method as claimed in claim 1 , characterized in that the polymers are thermoplastic polyurethanes (TPU).

Assignments (2)
MERGER Recorded Apr 18, 2017
From: RHEIN CHEMIE RHEINAU GMBH
To: LANXESS DEUTSCHLAND GMBH
Reel/Frame 042276/0052 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 20, 2015
From: LAUFER, WILHELM; ECKERT, ARMIN
To: RHEIN CHEMIE RHEINAU GMBH
Reel/Frame 035213/0898 →